ambrosia artemisiifolia

Noun
  1. Annual weed with finely divided foliage and spikes of green flowers;
    Common in North America;
    Introduced elsewhere accidentally (synset 111940230)
    is a type of: ambrosia, bitterweed, ragweed - any of numerous chiefly North American weedy plants constituting the genus Ambrosia that produce highly allergenic pollen responsible for much hay fever and asthma
    same as: common ragweed

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